Oldsmobile 2001 Alero - Manual (Page 85)

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To replace the battery in the remote keyless
entry transmitter:
1. Use a flat object like a coin to separate the
bottom half from the top half of the transmitter.
2. Remove the battery and replace it with the new one.
Make sure the positive (+) side of the battery faces
down. Use one three
- volt, CR2032, or equivalent,
type battery.
3. Put the two halves back together. Make sure the
cover is on tightly, so water won’t get in.
4. Resynchronize and then test the transmitter.
Resynchronization
Your remote keyless entry system is equipped with a
security system that prevents anyone from recording and
playing back your signal. The transmitter does not send
the same signal twice to the receiver. The receiver will
not respond to a signal that has been sent to it more
than once.
To resynchronize your transmitter and receiver,
follow these directions:
1. Stand close to your vehicle.
2. Press and hold the LOCK and UNLOCK buttons
on the transmitter at the same time.
3. Hold the buttons for seven seconds. In this time, the
doors should lock and unlock once. This confirms
the resynchronization. If the doors do not lock and
unlock, see your dealer for service.